PKSC 2010 Lecture Notes - Lecture 9: Ethylene, Medical Device, Tyvek
12 Oct 2017
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For low acid foods, the main objective is to destroy ??: botulinum. You want to lower the conc. of c. bot. by. 12 orders of magnitude (12 logs) = 1 f value. Thermal death time curve - speci c for each food at each temperature. Characteristic value for a speci c food at a speci c temperature for a decreasing bacteria by a factor of. F value = d value x 12 so f value is 12d time needed to destroy 12 orders of magnitude of microorgs. , usually at. Z value=temperature increment ( t) which speeds up the destruction of microorganisms by a factor of 10 (1 log) or lowers the rate by a factor of 1/10 (log) Uses steam or water under pressure to heat foods kills pathogens can alter texture and avor of foods. F250f for creamed corn #10 can = 23 min, Uses cobalt 60 (gamma) or electron beam (e-beam)
